1 // SPDX-License-Identifier: BSD-3-Clause 2 /* 3 * reloc_ia32.c - position independent x86 ELF shared object relocator 4 * Copyright (C) 1999 Hewlett-Packard Co. 5 * Contributed by David Mosberger <davidm@hpl.hp.com>. 6 * 7 * All rights reserved. 8 */ 9 10 #include <common.h> 11 #include <efi.h> 12 #include <elf.h> 13 #include <asm/elf.h> 14 15 efi_status_t _relocate(long ldbase, Elf32_Dyn *dyn, efi_handle_t image, 16 struct efi_system_table *systab) 17 { 18 long relsz = 0, relent = 0; 19 Elf32_Rel *rel = 0; 20 unsigned long *addr; 21 int i; 22 23 for (i = 0; dyn[i].d_tag != DT_NULL; ++i) { 24 switch (dyn[i].d_tag) { 25 case DT_REL: 26 rel = (Elf32_Rel *)((unsigned long)dyn[i].d_un.d_ptr + 27 ldbase); 28 break; 29 30 case DT_RELSZ: 31 relsz = dyn[i].d_un.d_val; 32 break; 33 34 case DT_RELENT: 35 relent = dyn[i].d_un.d_val; 36 break; 37 38 case DT_RELA: 39 break; 40 41 default: 42 break; 43 } 44 } 45 46 if (!rel && relent == 0) 47 return EFI_SUCCESS; 48 49 if (!rel || relent == 0) 50 return EFI_LOAD_ERROR; 51 52 while (relsz > 0) { 53 /* apply the relocs */ 54 switch (ELF32_R_TYPE(rel->r_info)) { 55 case R_386_NONE: 56 break; 57 58 case R_386_RELATIVE: 59 addr = (unsigned long *)(ldbase + rel->r_offset); 60 *addr += ldbase; 61 break; 62 63 default: 64 break; 65 } 66 rel = (Elf32_Rel *)((char *)rel + relent); 67 relsz -= relent; 68 } 69 70 return EFI_SUCCESS; 71 } 72